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    <title>flex-flow</title>
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    <h1>三、flex-flow实例</h1>
    <ul class="m-flow">
        <li>
            <h2>1.row nowrap(默认,从左到右,不换行)</h2>
            <div class="box g-box21">
                <div class="box1">我是box1</div>
                <div class="box2">我是box2</div>
                <div class="box3">我是box3</div>
                
            </div>
        </li>
        <li>
            <h2>2.row wrap(从左到右,换行)</h2>
            <div class="box g-box22">
                    <div class="box3">我是box1</div>
                    <div class="box2">我是box2</div>
                    <div class="box3">我是box3</div>
                    <div class="box2">我是box4</div>
                    <div class="box3">我是box5</div>
                    <div class="box2">我是box6</div>
                    <div class="box3">我是box7</div>
                    <div class="box2">我是box8</div>
                    <div class="box3">我是box9</div>
                    <div class="box2">我是box10</div>
                    <div class="box3">我是box11</div>
                    <div class="box2">我是box12</div>
            </div>
        </li>
    </ul>

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